code: def lower_upper(self):
      if self._lower_upper is None:
          self._lower_upper = {
              "lower": self.meta_data["lower"],
              "upper": self.meta_data["upper"],
              "feature_names_numerical": self.meta_data[
                  "feature_names_numerical"
              ],
          }
      return self._lower_upper
  
imports: import numpy
  import os
  import json
  import h5py
  from tqdm import tqdm
  from torchmeta.utils.data import Dataset, ClassDataset, CombinationMetaDataset
  from torchmeta.datasets.utils import get_asset
label_desc: Use image node_id 7 for calling the BachClassDataset obj's underlying member method code with example usage: obj.lower_upper() and returns: self